Does caps affects e mail

In general, the case of letters (uppercase or lowercase) in an email address does not affect its functionality or deliverability. Email addresses are case-insensitive, meaning that the same email address can be written in different cases and still be recognized by the email server.

For example:

However, there are a few exceptions and considerations to keep in mind:

  1. Email clients and servers: Some email clients or servers might be configured to be case-sensitive, which means they might treat uppercase and lowercase letters differently. For example, if an email client is set to be case-sensitive, it might not recognize an email address written in all lowercase letters.
  2. Domain name system (DNS): When sending an email, the DNS system is used to resolve the domain name to an IP address. In some cases, the DNS system might be case-sensitive, which could affect email delivery. However, this is relatively rare and usually only occurs with custom DNS configurations.
  3. Email address validation: Some email address validation tools or services might be case-sensitive, which means they might reject an email address written in a different case than the one they expect.
  4. Email subject lines and bodies: The case of letters in email subject lines and bodies can affect how they are displayed and indexed by email clients and search engines. For example, an email subject line written in all uppercase letters might be displayed differently than one written in all lowercase letters.

In summary, while the case of letters in an email address does not directly affect its functionality or deliverability, there are some exceptions and considerations to keep in mind, especially when it comes to email clients, servers, and validation tools.